Baby handprint anything = fail IMHO. Tried the baby footprint sweatshirt one year for Christmas (trying to make cute gift for Dad). Baby can’t walk and trying to hold up baby and get painted feet to mark the right spots on the shirt turned into epic fail! Fortunately, handy two-year-old was ready, willing and able. Just had to catch him after he walked across the shirt and before he ran across the rest of the room. He was ready for mass production.

I have done lots of foot print things because any hand print under age two is always an epic failure.
I put the baby in the high chair and hold the item in one hand and the ankle in the other. An assistant is always a plus! I did get one of those snowman ornaments for a gift froma two year old. Love it!

The key to this is doing it while the baby is asleep :)
I did it with my son when he was 6 or 7 months old last year, just waited until he was fast asleep. Used a brayer to apply paint to his hand and did 8 ornaments in a few minutes, my husband assisted by taking the wet ornaments and holding the brayer while I was doing the handprint. We cleaned up his hands with baby wipes…very easy, we used the satin style glass ornaments with non toxic acrylic paint.